add left corner widget to VEditWindow to display a list of tab

Signed-off-by: Le Tan <tamlokveer@gmail.com>

src/resources/icons/corner_tablist.svg

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generator: Adobe Illustrator 16.2.1, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 width="512px" height="512px" viewBox="0 0 512 512" style="enable-background:new 0 0 512 512;" xml:space="preserve">
+<g>
+	<path d="M464,144v288H48V144H464 M480,128H32v320h448V128L480,128z"/>
+	<rect x="72" y="96" width="368" height="16"/>
+	<rect x="104" y="64" width="304" height="16"/>
+</g>
+</svg>

src/veditwindow.cpp

@@ -46,8 +46,17 @@ void VEditWindow::setupCornerWidget()
     rightMenu->addAction(splitAct);
     rightMenu->addAction(removeSplitAct);
     rightBtn->setMenu(rightMenu);
-
     setCornerWidget(rightBtn, Qt::TopRightCorner);
+
+    // Left corner button
+    tabListAct = new QActionGroup(this);
+    connect(tabListAct, &QActionGroup::triggered,
+            this, &VEditWindow::tabListJump);
+    leftBtn = new QPushButton(QIcon(":/resources/icons/corner_tablist.svg"),
+                              "", this);
+    QMenu *leftMenu = new QMenu(this);
+    leftBtn->setMenu(leftMenu);
+    setCornerWidget(leftBtn, Qt::TopLeftCorner);
 }
 
 void VEditWindow::splitWindow()
@@ -124,6 +133,8 @@ void VEditWindow::closeFile(const QString &notebook, const QString &relativePath
     Q_ASSERT(editor);
     removeTab(idx);
     delete editor;
+
+    updateTabListMenu();
 }
 
 bool VEditWindow::closeAllFiles()
@@ -159,7 +170,9 @@ int VEditWindow::openFileInTab(const QString &notebook, const QString &relativeP
     tabJson["notebook"] = notebook;
     tabJson["relative_path"] = relativePath;
     tabJson["modifiable"] = modifiable;
-    return appendTabWithData(editor, tabJson);
+    int idx = appendTabWithData(editor, tabJson);
+    updateTabListMenu();
+    return idx;
 }
 
 int VEditWindow::findTabByFile(const QString &notebook, const QString &relativePath) const
@@ -186,6 +199,7 @@ bool VEditWindow::handleTabCloseRequest(int index)
         removeTab(index);
         delete editor;
     }
+    updateTabListMenu();
     noticeTabStatus(currentIndex());
     // User clicks the close button. We should make this window
     // to be current window.
@@ -306,3 +320,39 @@ void VEditWindow::contextMenuRequested(QPoint pos)
     menu.addAction(removeSplitAct);
     menu.exec(this->mapToGlobal(pos));
 }
+
+void VEditWindow::tabListJump(QAction *action)
+{
+    if (!action) {
+        return;
+    }
+
+    QJsonObject tabJson = action->data().toJsonObject();
+    int idx = findTabByFile(tabJson["notebook"].toString(),
+                            tabJson["relative_path"].toString());
+    Q_ASSERT(idx >= 0);
+    setCurrentIndex(idx);
+    noticeTabStatus(idx);
+}
+
+void VEditWindow::updateTabListMenu()
+{
+    // Re-generate the tab list menu
+    QMenu *menu = leftBtn->menu();
+    QList<QAction *> actions = menu->actions();
+    int nrActions = actions.size();
+    for (int i = 0; i < nrActions; ++i) {
+        QAction *tmpAct = actions.at(i);
+        menu->removeAction(tmpAct);
+        tabListAct->removeAction(tmpAct);
+        delete tmpAct;
+    }
+
+    QTabBar *tabbar = tabBar();
+    int nrTab = tabbar->count();
+    for (int i = 0; i < nrTab; ++i) {
+        QAction *action = new QAction(tabbar->tabText(i), tabListAct);
+        action->setData(tabbar->tabData(i));
+        menu->addAction(action);
+    }
+}

src/veditwindow.h

@@ -11,6 +11,7 @@
 
 class VNote;
 class QPushButton;
+class QActionGroup;
 
 class VEditWindow : public QTabWidget
 {
@@ -52,6 +53,7 @@ private slots:
     void removeSplit();
     void handleTabbarClicked(int index);
     void contextMenuRequested(QPoint pos);
+    void tabListJump(QAction *action);
 
 private:
     void setupCornerWidget();
@@ -62,14 +64,18 @@ private:
     inline QString getFileName(const QString &relativePath) const;
     inline VEditTab *getTab(int tabIndex) const;
     void noticeTabStatus(int index);
+    void updateTabListMenu();
 
     VNote *vnote;
     // Button in the right corner
     QPushButton *rightBtn;
+    // Button in the left corner
+    QPushButton *leftBtn;
 
     // Actions
     QAction *splitAct;
     QAction *removeSplitAct;
+    QActionGroup *tabListAct;
 };
 
 inline QString VEditWindow::getFileName(const QString &path) const

src/vnote.qrc

@@ -56,5 +56,6 @@
         <file>resources/icons/split_window.svg</file>
         <file>resources/icons/corner_menu.svg</file>
         <file>resources/icons/remove_split.svg</file>
+        <file>resources/icons/corner_tablist.svg</file>
     </qresource>
 </RCC>